'X' is a phylum which has organisms with jointed appendages, and a segmented body.
'Y' is a phylum which has organisms with a notochord present at some stages of their life.
Identify 'X' and 'Y'.
Arthropod means jointed legs. Animals which have jointed appendages belong to this phylum. This is the largest phylum in the animal kingdom. Features of Arthropoda are:
Protochordates have the following features: